As 130,000-plus geeks start pouring into San Diego today and nervous Hollywood executives put the finishing touches on their presentations, the rubber’s about to meet the road.

In some cases, fans eagerly await any morsel the studios will give them (see: “Avengers: Age of Ultron”). But in others, fans are uncertain — if not outright skeptical — and studios are tasked with turning around bad buzz.

Here are five big issues that might be on their minds:

1. “Jupiter Ascending”

It’s a never a good sign when, six weeks before a movie’s set to open, the studio delays its release by six months. The problem’s only compounded when the film in question comes from Andy and Lana Wachowski, whose last few releases include the poorly received “Cloud Atlas,” “Speed Racer,” and final “Matrix” movie. Channing Tatum’s bushy blond goatee in the trailer may not help either. Warner Bros. will have a lot to prove when it previews science-fiction film “Jupiter Ascending” Saturday.

2. “Teenage Mutant Ninja Turtles”

Paramount

Ever since a draft of a script that fans hated leaked in 2012, this reboot of the 1980s comic and cartoon has been trying to prove to fans it’s the “Ninja Turtles” movie they always wanted, not the Hollywood “reimagining” they feared. An early trailer led many to fear that, under the influence of producer Michael Bay, the movie would be too dark. But with significant reshoots over, Paramount will seek to finally turn the tide on Thursday.

3. “Star Wars: Rebels”

Disney

Walt Disney Co.’s purchase of Lucasfilm in 2012 led to the obvious jokes about Mickey Mouse meeting Luke Skywalker. But now the first new “Star Wars” content produced by the media conglomerate will get its public debut in the form of “Rebels,” an animated series that debuts this fall. Thursday’s panel, followed by a public screening, will let Disney show fanboys that it not only won’t ruin “Star Wars,” but is improving the franchise in the build-up to J.J. Abrams’ movie coming December, 2015.

4. “Gotham,” “Flash,” “Constantine,” “iZombie”

Grant Gustin as the Flash.

Warner Bros.

Warner Bros. has made much of the fact that while it lags Marvel on the movie front, it’s in the lead on TV, with four new series debuting this fall. Fans will judge at Comic-Con when all four series get a panel and screen footage, including a grand event Saturday evening that will feature the full pilots for “Flash” and Batman prequel “Gotham.”

5. The inevitable surprise

Studio art depicting Quicksilver.

Marvel Studios

Every year, studios make at least one announcement or appearance that shocks attendees and sets social media abuzz. Last year it was the revelation that the “Man of Steel” sequel will be “Batman vs Superman.” This year, with the “Avengers” sequel the only super-hero movie expected to show footage, fans will be eager for something unexpected.